Results 61 to 70 of about 145 (113)

Pattern Avoidance in Weak Ascent Sequences [PDF]

Discrete Mathematics & Theoretical Computer Science
In this paper, we study pattern avoidance in weak ascent sequences, giving some results for patterns of length 3. This is an analogous study to one given by Duncan and Steingr\'imsson (2011) for ascent sequences. More precisely, we provide systematically
Beáta Bényi, Toufik Mansour, José L. Ramírez   +2 more
doaj   +1 more source

Weighted cylindric partitions. [PDF]

J Algebr Comb (Dordr), 2022
Bridges W, Uncu AK.
europepmc   +1 more source

Staircase patterns in words: subsequences, subwords, and separation number. [PDF]

Eur J Comb, 2020
Mansour T, Rastegar R, Roitershtein A.
europepmc   +1 more source

Enumeration of coalescent histories for caterpillar species trees and p-pseudocaterpillar gene trees. [PDF]

Adv Appl Math, 2021
Alimpiev E, Rosenberg NA.
europepmc   +1 more source

Alternating sign matrices with reflective symmetry and plane partitions: $n+3$ pairs of equivalent statistics and a Cauchy-type identity

Forum of Mathematics, Sigma
Vertically symmetric alternating sign matrices (VSASMs) of order $2n+1$ are known to be equinumerous with lozenge tilings of a hexagon with side lengths $2n+2,2n,2n+2,2n,2n+2,2n$ and a central triangular hole of size $2$ that exhibit
Ilse Fischer, Hans Höngesberg
doaj   +1 more source

A combinatorial proof of a result for permutation pairs

Open Mathematics, 2012
Mansour Toufik, Shattuck Mark
doaj   +1 more source

Finite automata, probabilistic method, and occurrence enumeration of a pattern in words and permutations. [PDF]

SIAM J Discret Math, 2020
Mansour T, Rastegar R, Roitershtein A.
europepmc   +1 more source

Secant tree calculus

Open Mathematics, 2014
Foata Dominique, Han Guo-Niu
doaj   +1 more source

Parity-alternating permutations and successions

Open Mathematics, 2014
Munagi Augustine
doaj   +1 more source

Two explicit formulas for the generalized Motzkin numbers. [PDF]

J Inequal Appl, 2017
Zhao JL, Qi F.
europepmc   +1 more source